Step 1

Preheat oven to lowest setting, grease a rimmed baking sheet with cooking spray, and keep warm in the oven.

Step 2

In a large stockpot, bring butter, sugar, and salt to a boil over medium heat, stirring frequently (almost constantly), until temperature reaches 300 degrees F using a candy thermometer.

Step 3

Remove from heat and immediately stir in vanilla.

Step 4

Quickly and carefully pour the mixture onto warm greased pan.

Step 5

Spread the brittle by picking up the pan and tilting it around until it covers the entire pan.

Step 6

Let the brittle set until firm, but still warm, this should only take a few minutes.

Step 7

Spread the melted chocolate into a thin even layer over the brittle.

Step 8

Sprinkle the nuts over the chocolate, and carefully press down to ensure the almonds stick to the chocolate.

Step 9

Place the toffee in the freezer until set.

Step 10

Break into pieces, and store in an airtight container in the fridge or freezer.